Improved apparatus for punching corrugated metals



NITED VSTATEs PATENT OEEIcE.

MARY JANE MONTGOMERY, OF YORK, N. Y.

lMPROVEDVAPPARATUS FOR PUNCHING CORRUGATED METALS.

Specification forming part of Letters Patent No. 54.580, dated May S,1866.

vTo all whom it may concern:

Be it known that I, MARY J ANE MONTGOM- ERY, ot the city, county, andState of New York, have inventeda new and useful Apparatus for PunchingBoltor Rivet Holes in Oory Y ruga'ted or Curved Metals; and I do herebydeclare the followl'lg to be a full and exact description thereof,reference being had to the aecompal'iyin g drawings, and to the lettersof reference marked thereon.

Much difficulty is well known to exist in making bolt or rivet holes by,an y of the ordinary or commonly-used processes in corrugated or curvedmetallic sheets, plates, or beams when the-holes are required to bemadethrough the curve or corrugations 'and trailsverse to the line of thecurve or corrugations.

The object ot' my invention is to enable the operatoror workman to dothis with as much facility and certainty in the line of direction of theholes as it' he were operating upon a plain or iiat sheet or plate ofthe same metal. In the drawings forming a pa rtof this specification andhereto attached, Figure I shows the tool l use with a portion ot' astraight corrugated beam-iron passed through it. Fig. II is a sectionot' this tool through the lme a .fr of Fig. I. Fig. III shows the toolapplied to a curved corrugated beam or sheet, and Fig. IV a portion ofthe beam or sheet with the holes punched therein. l

In all these figures the same letter refers to the same part. p

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and mode of operation.

The tool A, Fig. I, is made in two sections, a a', as seen in Fig. II,with undulating surfaces adapted to the corrugations or curved surfacesofthe sheet or beam, and with an interval between their facescorresponding to the thickness of the said sheet or beam. These twosections are adjusted to each other at this distance, and heldin placeby means of a plate on each side, (marked 111),) Fig. Il. Through theseplatesand the interlocking waved surfaces of the two sections a a astraight hole is made to receive the punch or punches c c.

In using the apparatus or tool, the curved or corrugated sheet or beamis passed into the space between thel two approximatingt'aces of a and ato the distance required, and the punch or punches c c driven throughits passway from b to b, or from one face ot' the tool to the other,carrying with it the'plug ofmetal. which it displaces from each one ot'the corrugations or curves ot' the interposed plate or beam. As thedirection ot' the panch cannot diverge from that given it by the hole inwhich it moves, it is evident that the holes made in the sheet or beammust exactly correspond with each other in all their curves orcorrugations, as shown in the side of one ot' them in Fig. IV. When itis necessary to punch holes in two beams or sheets, one lapping over orinto the other, the interval between the parts a and a', as shown inFigs. II, must be increased sufficiently to receive these together.

It maybe necessary sometimes to apply this apparatus to curved beams orsheets, as shown in Fig. III. If this curvature be uniform from one endor" the beam or sheet to the other, then its curvature will have to bemade the same; but it' the beam or sheet be curved at only oneplace andthe rest straight, or nearly so, then, to enable the tool to pass overthe whole length, its outer ends must be made with a -Haring mouth,andthe orifice for the punch at M. JANE MoNTeoMERY.'

Witnesses:

HKING, RICHARD MONTGOMERY.

